#97 Frontend fails to build.

[Carlo Bramini]

When building SVN r6505 (the latest at the time of writing), the build fails with this message:

gcc -DHAVE_CONFIG_H  -I. -I../../frontend -I.. -I../../include -I../../frontend -I../../libmp3lame -I../../include -I../.. -I..    -O3 -fomit-frame-pointer -ffast-math -Wall -pipe      -MT get_audio.o -MD -MP -MF .deps/get_audio.Tpo -c -o get_audio.o ../../frontend/get_audio.c
../../frontend/get_audio.c:102:38: error: unknown type name ‘plotting_data’
  102 | extern void hip_set_pinfo(hip_t hip, plotting_data* pinfo);
      |                                      ^~~~~~~~~~~~~

Attached patch fixes the error.
Platform: CYGWIN
Configured with options: --disable-static --enable-shared --disable-decoder

[Carlo Bramini]

The patch.

[Alexander Leidinger]

Committed. Thanks!